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Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (13): 1329-1333. Previous Articles     Next Articles

Original Articles

热处理温度对铬掺杂二氧化钛表面结构和性质的影响

高碧芬1,2，马颖1，曹亚安3，姚建年*,1   

  1. (1中国科学院化学研究所 光化学重点实验室 北京100080)
    (2中国科学院研究生院 北京100039)
    (3南开大学物理学院 天津300071)
  • 投稿日期:2005-11-01 修回日期:2006-03-02 发布日期:2006-07-14
  • 通讯作者: 姚建年

Effect of Annealing Temperature on the Surface Structure and Properties of Chromium Doped Titania

GAO Bi-Fen1,2, MA Ying1, CAO Ya-An3, YAO Jian-Nian*,1   

  1. (1 Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080)
    (2 Graduated School of Chinese Academy of Sciences, Beijing 100039)
    (3 College of Physics, Nankai University, Tianjin 300071)
  • Received:2005-11-01 Revised:2006-03-02 Published:2006-07-14
  • Contact: YAO Jian-Nian

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Chromium doped titanium dioxide Cr-TiO2 was prepared by the sol-gel method. The effects of annealing temperature on the crystal structure, oxidation states of chromium, and UV-vis absorption properties of Cr-TiO2 were investigated in details. Experiment results showed that chromium mainly existed on TiO2 surface as Cr2O3 and chromate or dichromate of Cr6＋ in Cr-TiO2 annealed at temperature no higher than 723 K. The content of Cr6＋ was increased with the increase of temperature. The visible light absorption of Cr-TiO2 within 400～550 nm should be attributed to the 4A2→4T1 transition of Cr3＋and the O→Cr6＋charge transfer (1t1→2e). The absorption within 620～800 nm was due to the 4A2→4T2 transition of Cr3＋. The former was strengthened with the increase of annealing temperature, whereas the latter was weakened.

Key words: semiconductor, doping, titanium dioxide, chromium, visible light absorption